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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4e62476358d17f500b3e32ae42a2411944c71e26a9be0e20f4dfae5b9db14d' 
  AND token = '95GeDfwTaKzgVT0IEM2woBFwZlVqCAnWB9EGltBFLIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}